Acetic Acid → 4-(2,6-Difluoro-4-methoxyphenyl)-1,3-dimethyl-1H-pyrazole-5-amine

Participants

Reaction Conditions

Reaction Steps

α-Acetyl-2,6-difluoro-4-methoxybenzeneacetonitrile (i.e. the product of Step B) (8.03 g, 35.7 mmol) and acetic acid (5 mL) were stirred in ethanol (35 mL), and methylhydrazine (1.91 mL, 35.7 mmol) was added. The reaction mixture was heated at reflux for 16 h, cooled, and then poured into water (100 mL). The resulting mixture was extracted with ethyl acetate (100 mL). The organic phase was washed with 1 N aqueous NaOH (50 mL) and then brine (50 mL), dried over MgSO4, and concentrated to leave a solid. The solid was dissolved in methanol, and the resulting solution was warmed to 45° C. Water (25 mL) was added dropwise, and the mixture was allowed to cool. The precipitate was collected on a glass frit to give the title compound as a white solid (3.88 g).

Provenance & Evidence